unit2.pas

delphi开发环境下的 个人所得税计算器的编程

unit Unit2;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls;

type
  TForm2 = class(TForm)
    Label1: TLabel;
    Label2: TLabel;
    Edit1: TEdit;
    Edit2: TEdit;
    Button1: TButton;
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form2: TForm2;

implementation

{$R *.dfm}

procedure TForm2.Button1Click(Sender: TObject);
var
  i:Integer;//i为收入
  m:Integer;//m为收税部分 即工资-1600
  d:Double;//d为税率
  mistake:TForm;
begin
  i:=strtoint(edit1.text);
  if i<=1600 then
     // ShowMessage('工资不高于1600，不收税')
     // mistake:=CreateMessageDialog('工资不高于1600，不收税',mtConfirmation,[mbok])
    edit2.text:='工资不高于1600，不收税'
  else
    begin
      m:=i-1600 ;
      case i of
        0..500:d:=0.05;
        501..2000:d:=0.1;
      else d:=0.15;
      end;
      edit2.text:=floattostr(m*d);
    end;

end;

end.